Hardware
What the slab is made of.
Quantumicy is one object with one job: hold private keys for cryptocurrency and show a request on its own glass before anything is signed.
Frame and face
The chassis is brushed bronze-colored metal. The face is matte charcoal. The slab is narrow and tall, so it can stand on a short edge and still be covered by a hand. The word Quantumicy is engraved under the screen.
There is no camera, no fingerprint pad, and no second display. The only window is the tall rectangle the chip paints.
The three buttons
A column of round buttons sits to the right of the glass. The top and bottom buttons move through what the screen is showing, or dismiss it. The middle button is marked with a yellow ring. That ring is the confirm. A signature leaves the chip only after that press.
A PIN is entered on these same buttons. The computer keyboard is not part of that step.
Screen, cable, cell
The screen is a vertical black panel. During setup it shows the recovery phrase a single time. During a session it shows the request the chip is willing to sign. Pixels on that panel are drawn by the chip, not by the computer at the other end of the cable.
USB-C brings the session. Quantumicy does not pair over the air: there is no Wi-Fi and no Bluetooth radio in the slab. A sealed cell can hold the glass on long enough to finish reading after the cable is unplugged. The cell does not open a network connection.
The security model describes how those parts work together. The notes take each habit one at a time.
